Farmer Ray
New member
- Joined
- Sep 20, 2025
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- 1
On fertilizer labels, NPK stands for the percentage by weight of the three primary macronutrients: Nitrogen, Phosphorus (as phosphate), and K potassium (as potash).
I'm currently using a product I like with N-P-K 4-5-13, but it is a little expensive and I would like to mix the three raw ingredients myself, but need to do so in the appropriate ratio. They each have a different N-P-K ratio.
The three raw ingredients are: Fish Protein Hydrolysate 12-1-1, Potassium Sulfate 0-0-50, Bone Meal 3-15-0
How much of each raw ingredient do I need achieve a N-P-K ratio of 4-5-13? If that ratio is not possible, then what ratio would be closest?
I'm currently using a product I like with N-P-K 4-5-13, but it is a little expensive and I would like to mix the three raw ingredients myself, but need to do so in the appropriate ratio. They each have a different N-P-K ratio.
The three raw ingredients are: Fish Protein Hydrolysate 12-1-1, Potassium Sulfate 0-0-50, Bone Meal 3-15-0
How much of each raw ingredient do I need achieve a N-P-K ratio of 4-5-13? If that ratio is not possible, then what ratio would be closest?